Vue uses ref to let the parent component call the child component instance-JS Tutorial-php.cn

Vue uses ref to let the parent component call the child component instance

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Release： 2018-02-09 11:50:12

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The three buttons on the parent component can call the three loading methods of the sub-component to perform different operations. This article mainly introduces how Vue uses ref to let the parent component call the child component. Friends who need it can refer to it. I hope it can help everyone.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script src="vue.js" charset="utf-8"></script>
</head>
<body>
  <p id="app">
    <loading ref=&#39;load&#39;></loading>
    <button type="button" @click=&#39;show&#39;>显示</button>
    <button type="button" @click=&#39;hide&#39;>隐藏</button>
    <button type="button" @click=&#39;changeColor&#39;>变色</button>
  </p>
</body>
<script type="text/javascript">
  let loading = {
    data() {
      return {
        flag: true
      }
    },
    template: &#39;<p v-show="flag">loading...</p>&#39;,
    methods: {
      hide() {
        this.flag = false
      },
      show() {
        this.flag = true
      }
    }
  }
  let vm = new Vue({
    el: &#39;#app&#39;,
    components: {
      loading
    },
    methods: {
      // 在组件上的ref获取组件实例
      // 标签的ref 获得标签的dom
      // 使用refs 获取组件实例，然后调用组件的方法即可
      hide() {
        this.$refs.load.hide()
      },
      show() {
        this.$refs.load.show()
      },
      changeColor() {
        // 获取dom实例 操作样式
        this.$refs.load.$el.style.background = &#39;red&#39;
      }
    }
  })
</script>
</html>

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